InterruptThrottleRate cannot be set for Intel network driver modules

Solution Verified - Updated -

Issue

  • The Intel Sourceforge documentation describes a module option InterruptThrottleRate, however this option does not appear to be available under the RHEL driver modules:
$ modinfo igb | egrep "filename|parm"
filename:       /lib/modules/2.6.32-279.19.1.el6.x86_64/kernel/drivers/net/igb/igb.ko
parm:           max_vfs:Maximum number of virtual functions to allocate per physical function (uint)

$ modinfo ixgbe | egrep "filename|parm"
filename:       /lib/modules/2.6.32-279.19.1.el6.x86_64/kernel/drivers/net/ixgbe/ixgbe.ko
parm:           IntMode:Change Interrupt Mode (0=Legacy, 1=MSI, 2=MSI-X), default 2 (array of int)
parm:           FdirMode:Flow Director filtering modes (0=Off, 1=Hashing) default 1 (array of int)
parm:           max_vfs:Maximum number of virtual functions to allocate per physical function (uint)
parm:           allow_unsupported_sfp:Allow unsupported and untested SFP+ modules on 82599-based adapters (uint)
  • What is the ethtool equivalent of ixgbevf option InterruptThrottleRate="1,1,1,1,1,1,1,1"?
  • Amazon AWS documentation Enabling Enhanced Networking on Linux Instances in a VPC directs us to use a modprobe file with options ixgbevf InterruptThrottleRate but this does not change anything.
  • When the server boots, it gives below errors and is inaccessible over network.:
ixgbevf: Unknown parameter `InterruptThrottleRate'
  • Why ixgbevf driver does not accept the InterruptThrottleRate option in the /etc/modprobe.d/ixgbevf.conf file ?

  • How to disable ITR or set ITR into Adaptive, Conservative, or Simplified Balancing coalesce mode for Intel NIC driver?

Environment

  • Red Hat Enterprise Linux 6 or earlier
    • Intel network interface using igb, ixgbe, or ixgbevf drivers
  • Red Hat Enterprise Linux 7 or later
    • Intel network interface using e1000, e1000e, igb, ixgbe, or ixgbevf drivers

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